Try calling them- A lot of places (I've dealt with Midwest before and they always helped me out) will be able to do something for you they don't have online or in their catalog. Just tell them you are interested/about to buy that kit, but tell them what you want. More then likely, they'll still be able to work out a pretty sweet deal for you. Good luck!

I ordered their 3 keg kit about two months back and its fantastic. I cut off two of the picnic taps and bought 2 of their large refrigerator conversion kits and stuck them through the door, I use the third as a picnic tap on the inside (for beverages that are consumed less frequently.)

I already regret not getting perlicks (forward sealing taps) as mine are starting to stick, but I will be cleaning them after the next kegs are kicked.

In terms of extra kegs, check out pedalbiker in the classifieds, I ordered 4 kegs from him and they came in pristine condition (with colored tops even!) or chi company.

Lastly, I would check around you for fire extinguisher refill locations to see if they will refill CO2 tanks on location, you wont want to give up that shiny new tank!